EP1710061B1 - Méthode de préchauffage en continu d'un mat ou d'un non tissé, et prépresse utilisé - Google Patents

Méthode de préchauffage en continu d'un mat ou d'un non tissé, et prépresse utilisé Download PDF

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Publication number
EP1710061B1
EP1710061B1 EP20060007422 EP06007422A EP1710061B1 EP 1710061 B1 EP1710061 B1 EP 1710061B1 EP 20060007422 EP20060007422 EP 20060007422 EP 06007422 A EP06007422 A EP 06007422A EP 1710061 B1 EP1710061 B1 EP 1710061B1
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EP
European Patent Office
Prior art keywords
mat
prepress
side walls
compaction
steam
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP20060007422
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German (de)
English (en)
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EP1710061A1 (fr
Inventor
Gernot Dr. Von Haas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dieffenbacher GmbH Maschinen und Anlagenbau
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Dieffenbacher GmbH Maschinen und Anlagenbau
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Publication of EP1710061A1 publication Critical patent/EP1710061A1/fr
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Publication of EP1710061B1 publication Critical patent/EP1710061B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone

Definitions

  • the invention relates to a method for continuously preheating a nonwoven or a mat, especially a mat of elongated or flat wood chips or chips according to the preamble of claim 1 and a pre-press for carrying out the method according to claim 8.
  • chips or chips are usually oriented strewn and hot pressed into so-called "OSB” panels (oriented strand boards, woodchips oriented longitudinally and laterally) or "OSL” panels (oriented strand lumber, shreds only longitudinally oriented) or “LSL” panels (long strand lumber, long chips only longitudinally oriented).
  • OSB oriented strand boards, woodchips oriented longitudinally and laterally
  • OSL oriented strand lumber, shreds only longitudinally oriented
  • LSL long strand lumber, long chips only longitudinally oriented
  • a basic method for preheating a nonwoven or a mat is with DE 36 40 682 A1 known.
  • steam is introduced from at least one broad side of the web and completely or partially passed therethrough.
  • the mat is precompressed before steaming and on the opposite Side of the vapor deposition, a vacuum can be applied.
  • the device is carried out similar to a pre-press and consists of an upper and lower circumferential permeable belt.
  • the preheating of a high mat of chips is not possible with this method and this device, since the mat can not be heated evenly, since the steam can escape laterally at the edge before reaching the middle of the mat.
  • Scattered chips due to their geometry perpendicular to the mat surface, have a 5 to 30 times higher flow resistance than parallel to the mat surface.
  • the steam introduced perpendicular to the mat surface is preferably diverted into a horizontal steam flow and thus exits from the narrow sides.
  • the flow is divided in the middle of the mat across the width seen in a vertical flow and a horizontal flow, so that individual mat areas are not traversed by the steam. It form air pockets that have a few inches in length, width and thickness.
  • no high vapor pressure can be built up. Because the steam can escape sideways immediately after leaving the steam boxes, the steam pressure in the mat is always very low and thus the driving pressure gradient is not sufficient for thicker mats to heat the entire mat.
  • the invention is based on the object of specifying a method with which a steam flow can be generated in a mat which has a single flow direction perpendicular to the broad side of the mat and prevents uneven heating of individual mat areas.
  • the solution to this problem for the method is that the narrow sides of the scattered mat are guided with a side wall and sealed when entering the device for preheating to the atmosphere, the mat from a surface side to a density of 150 - 450 kg / m 3 , preferably 250kg / m 3 , is compressed and the mat is supplied on the same surface side water vapor for preheating while the mat compression is continuously withdrawn and removed on the opposite surface side to the forced guidance of the water vapor through the mat this or vacuum or vacuum is applied and then the mat is compressed again in the outlet of the device.
  • the solution for a pre-press for carrying out the method according to claim 8 is that the revolving upper screen belt is arranged on the height-adjustable compression rollers between the fixed side walls and that for sealing the upper screen belt to the side walls, a height-adjustable seal and for sealing the lower screen belt a Seal are arranged.
  • the air in the mat is pressed against the feed direction of the mat.
  • the mat has a higher mat density of 150-450 kg / m 3 , preferably 250 kg / m 3 .
  • the ratio of vertical to horizontal flow resistance changes with increasing mat density.
  • the ratio of horizontal to vertical flow resistance is 30 to 1 and at 350 kg / m 3 mat density only 5 to 1. This means that the pre-compression to 250 kg / m 3 to 350 kg / m 3 mat density, the horizontal flow resistance is increased and thus also a certain sealing of the steam takes place in and against the production direction.
  • a 400 mm thick mat can be heated by this method in less than 10 seconds to a uniform temperature of 100 ° C, which represents the limit for starting the reaction for the normally present reactive adhesive.
  • the moisture of the entire mat is increased by the vapor condensation by about 5% and the temperature of the mat after the vapor deposition is between 95 and 120 ° C.
  • the temperature level depends on the achieved steam overpressure in the mat and on the degree of overheating of the steam.
  • the increase in mat moisture depends on the mat start temperature. As the mat start temperature increases, less thermal energy is required, which causes less water vapor to condense and lessens the mat's moisture content.
  • the setting of the mat initial temperature can be carried out via a temperature control of the chips in the scattering bin, during the scattering or over preheating devices in front of the device for preheating, for example by means of convection radiation or microwave preheating.
  • the steaming during a discharge of the mat supports the negative pressure in the mat, since the resulting additional volume of the mat can only be filled by steam. An air access is not possible on the narrow mesh surfaces due to the seal. On the underside either a discharge of water vapor, an exhaust or vacuum is applied, whereby the preferred single flow direction is supported.
  • the increase in mat density during precompression and outflow greatly impedes horizontal flow in and against the direction of production, so that neither air from the area in front of the device nor cooled vapor from the area downstream of the device Device can occur in the steaming of the device for preheating. This maximizes the desired vertical flow direction to the production direction in the mat.
  • the sealing of the upper steam plate and the upper screen belt to the side wall can be done with a pressing bar to achieve a high density.
  • the seal to the continuous side wall is technically easy to implement and reliable in operation. It can be realized with this pre-press steam pressures in the mat up to 4 bar.
  • a Siebbandverlauf, ie a lateral swinging of the band in the production direction, in the region of the steam plate does not affect the seal towards the atmosphere.
  • the upper screen belt does not have to be sealed at the edge either.
  • the lower screen belt may be guided under the side walls in the construction, and means for sealing may be simply and conveniently applied to the underside of the side walls, such as plastic straps or sealing lips. But it can also be performed within the side wall and experience a similar seal as the top guided screen belt.
  • the seal on the lower wire is less critical in this area than on the side of the steam supply, since there the pressure is lower or when connecting a suction or a negative pressure (vacuum) entering air is sucked immediately in case of leaks without completely enter the mat to be able to.
  • the short circuit currents in these areas are marginal and change the mat Negative only in the marginal areas, which are removed anyway when trimming after the successful plate production.
  • the steam boxes and extraction boxes must be carried out in principle over the entire length of the Bedampfungsddle continuously to apply a high vapor pressure to the mat. To avoid a short circuit flow between the beach and the side wall, several measures can be taken. The mat density at the edge can be increased, which increases the flow resistance.
  • the increase in density can also be carried out on a specially designed steaming plate with low mat height at the edge or by a peripheral circulating separate band. It can also be the evaporation surface only to about 100 - 400 mm to the side edge out.
  • Another possibility is to increase the density on the narrow sides, that the pre-press for preheating has a narrower wire width than the forming belt and thus, for example, a 4-meter-wide mat is scattered, the narrowing by side walls just before the pre-press a reduction in width , for example, learns to 3.6 meters and then enters the pre-press for preheating.
  • the sidewalls In order to secure the mat against sideways falling off of individual strands with very high mats and to promote the homogeneity of the mat from the spreader to the preheater for preheating, the sidewalls should start from the first spreader (scattering wall) until after the first Preheating be performed continuously.
  • the side wall is made smooth towards the mat.
  • the mat may be subjected to another shot of steam from below to achieve the same overheating as on the top of the mat when using superheated steam.
  • plate curvatures can be avoided after the continuous press in the final product.
  • FIG. 1 is the pre-press 3 for preheating a mat 12 between a spreader 2, possibly consisting of several scatter boxes (not shown), and a continuously operating press 1 (only the Press inlet shown) for the production of plates in section.
  • the pre-press 3 for preheating consists of two height-adjustable compression rollers 6, 6 ', two likewise height-adjustable circulating rollers 4, 4', the rotating screen belts 5, 5 ', compression rollers 15, steam boxes 7 and suction boxes 8.
  • a plurality of precompression rollers 15 may be arranged.
  • the steam boxes are 7 to just before the rear height-adjustable compression roller 6 ', in which case a sealing lip 13 is arranged here.
  • the suction boxes 8 arranged on the lower screen belt 5 ' are likewise provided with a sealing lip 13 for the circulation roller 4'.
  • the sealing lips 13 are designed to be adjustable in height in order to adapt to the respective setting situation of the compaction roller 6 'or circulating roller 4'.
  • the narrow sides of the scattered mat 12 are guided with the side walls 9 and sealed to the atmosphere; Subsequently, the mat 12, starting from a surface side by means of a height-adjustable compression roller 6 and the rotating thereon screen belt 5 to a density of 150 - 450 kg / m 3 , preferably 250kg / m 3 , compressed and then the mat 12 on the same surface side water vapor fed through the steam boxes 7 for preheating while the mat compression is continuously withdrawn.
  • the mat 12 is again compressed in the outlet of the pre-press 3 with a height-adjustable compression roller 6 '.
  • This compression can still be supported by the circulation roller 4 '.
  • the steam for preheating can be supplied with an overpressure of 0.1 to 10 bar on the steam boxes 7 and in the outlet of the pre-press 3, the mat 12 can be compressed to 150 to 390 kg / m 3 to a certain sealing effect in the mat 12th to evoke oneself.
  • the device 3 is characterized in that the circumferential upper screen belt 5 is guided vertically adjustable between the fixed side walls 9, wherein the upper screen belt 5 is sealed by means of a height-adjustable seal 16 to the side walls 9 and the side walls 9 on the lower wire belt 5 'are arranged sealed depending on the version.
  • the side walls 9 may be arranged with a corresponding seal 18 on the lower wire 5 'standing.
  • the seals 18 are designed as sealing lips and the corresponding counterparts are sealed to the wire 5 'with plastic. But it can also be carried out in a constructive adaptation so that the lower screen belt 5 'is guided between the side walls 9. Then a seal to the suction boxes 8 would be necessary.
  • the spreader 2 could also scatter directly onto the lower wire 5 'of the pre-press 3. This would facilitate an external compaction by reducing the passage between the side walls 9 when placed above the lower screen belt 5 '.
  • FIG. 3 can be found in a variant of FIG. 1 points drawn in order to further specify the process parameters with regard to the mat density or mat height for uniform heating:
  • Point Matt density mat height a) 60 - 100 kg / m 3 100% b) 150 - 450 kg / m 3 15 - 50% c) 150 kg / m 3 40 - 50% d) 200 - 350 kg / m 3 20 - 70% e) 80 -100 kg / m 3 90 - 100%
  • the mat back pressure at a mat density of 250 kg / m 3 is about 0.2 N / mm 2 .
  • This counterpressure leads to springback of the mat 12, so that the upper screen belt 5, despite a belt tension of 5 to 50 N / mm, conforms to the vertically adjustable rear circulation rollers of the device (point cd) and nevertheless maintains contact with the steam boxes 7 ,
  • the introduced sealing lips 13 between the steam boxes 7 and the suction boxes 8 and the rear compaction roller 6 'or circulating roller 4' must properly seal and be designed accordingly height adjustable.
  • the lower circulation roller 4 'of the lower wire belt 5' can be made adjustable in height from the mat 12 at too high back pressures in order to achieve an appropriate increase in density at point d) compared to point c).
  • FIG. 3 It is shown that in order to support the screen belts 5 in the initial region of the pre-press 3, a precompression belt 14 is arranged between the precompression rollers 15 and the screen belts 5, 5 '. It is possible to carry out this Vorverdichtungsb sections 14 above and below as further Siebb stands, perform one of the two as impermeable belt or even to design both sealing. In the latter case, the compressed air would escape through the mat 12 opposite to the direction of production. An alternative is also the scattering of the mat 12 on the lower screen belt 5 'of the device 3 in the spreader 2.
  • the steam chambers 7, the suction chambers 8 and the steam boxes 10 are made variable and segmented in length and width and these segments can be individually controlled in their parameters.
  • different evaporation modes such as wedge-shaped or line-shaped vapor deposition over the width of the mat 12 can be realized.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Treatment Of Fiber Materials (AREA)

Claims (22)

  1. Procédé pour le préchauffage en continu d'une nappe (12) de copeaux ou de particules de bois allongées ou plates dispersées de façon orientée ou non orientée en une ou plusieurs couches lors de la fabrication de panneaux de matériau à base de bois, caractérisé en ce qu'il comprend les étapes de procédé suivantes :
    1.1 les petits côtés de la nappe (12) dispersée sont guidés par une paroi latérale (9) et isolés de l'atmosphère à l'entrée dans la presse de préformage (3) ;
    1.2 la nappe (12) est compactée à partir d'un côté plat à une densité de 150 à 450 kg/m3, de préférence 250 kg/m3;
    1.3 de la vapeur d'eau est amenée sur le même côté plat de la nappe (12) pour le préchauffage, en réduisant en même temps de façon continue le compactage de la nappe et en coupant la vapeur d'eau ou en appliquant un vide sur le côté plat opposé pour forcer le passage de la vapeur d'eau à travers la nappe (12) et
    1.4 la nappe (12) est à nouveau compactée à la sortie de la presse de préformage (3).
  2. Procédé selon la revendication 1, caractérisé en ce que la vapeur d'eau servant au préchauffage est amenée sous une surpression de 0,1 à 10 bars.
  3. Procédé selon la revendication 1 et 2, caractérisé en ce qu'à la sortie de la presse de préformage (3), la nappe (4) est compactée entre 150 et 390 kg/m3.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce qu'entre la presse de préformage (3) et la presse en continu (1), le côté de la nappe qui n'a pas été directement exposé à la vapeur dans la presse de préformage (3) est exposé à la vapeur.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que les bords de la nappe sont compactés jusqu'à 1000 kg/m3 pendant le pré-compactage.
  6. Procédé selon les revendications 1 à 5, caractérisé en ce que les bords de la nappe ne sont pas exposés à la vapeur.
  7. Procédé selon les revendications 1 à 6, caractérisé en ce que la densité est augmentée sur les bords de la nappe par un resserrement des parois latérales (9) avant l'entrée de la presse de préformage (3).
  8. Presse de préformage pour le préchauffage en continu d'une nappe de copeaux ou de particules de bois allongées ou plates dispersées de façon orientée ou non orientée en une ou plusieurs couches lors de la fabrication de panneaux de matériau à base de bois pour la mise en oeuvre du procédé selon la revendication 1, composée de bandes criblées (5, 5') tournant autour de rouleaux de mise en circulation (4, 4') et de rouleaux de compactage (6, 6', 15), sur lesquelles sont disposées des caissons de vapeur (7) et des caissons d'aspiration (8), caractérisée en ce que la bande criblée supérieure (5) en circulation est disposée au-dessus des rouleaux de compactage (6, 6') réglables en hauteur entre les parois latérales (9) stationnaires et en ce qu'il est prévu un joint réglable en hauteur (16) pour assurer l'étanchéité de la bande criblée supérieure (5) par rapport aux parois latérales (9) et un joint (18) pour assurer l'étanchéité de la bande criblée inférieure (5').
  9. Presse de préformage selon la revendication 8, caractérisée en ce que la bande criblée inférieure (5') est guidée avec des joints d'étanchéité extérieurs entre les parois latérales (9) par-dessus les caissons d'aspiration (8).
  10. Presse de préformage selon les revendications 8 à 9, caractérisée en ce que les bandes criblées (5, 5') sont pressées plus fortement en direction de la nappe (12) sur les côtés extérieurs de la nappe (12) au moyen de moyens appropriés tels que des rouleaux ou bandes d'appui, en tenant compte de l'étanchéité.
  11. Presse de préformage selon les revendications 8 à 10, caractérisée en ce que les caissons de vapeur (7) et/ou les caissons d'aspiration (8) ont une forme concave en direction de la nappe (12) afin de compacter plus fortement les côtés extérieurs.
  12. Presse de préformage selon la revendication 8, caractérisée en ce que les parois latérales (9) sont disposées verticalement sur la bande criblée inférieure (5') avec un joint d'étanchéité correspondant (18).
  13. Presse de préformage selon les revendications 8 à 12, caractérisée en ce qu'il est prévu à la sortie de la presse de préformage (3) en dessous de la bande criblée (5') et avant l'entrée de la nappe (12) dans la presse en continu (1) un ou plusieurs caissons de vapeur (10) disposés sous la nappe (12).
  14. Presse de préformage selon les revendications 8 à 13, caractérisée en ce que les parois latérales (9) sont disposées de la machine de dispersion (2) jusqu'à la sortie de la presse de préformage (3) peu avant la presse en continu (1).
  15. Presse de préformage selon les revendications 8 à 14, caractérisée en ce que les bandes criblées (5, 5') sont plus étroites que la bande de formage (17) sous la machine de dispersion (2) et les parois latérales (9) entre la machine de dispersion (2) et la presse de préformage (3) sont disposées de façon à réduire la largeur de la nappe (12).
  16. Presse de préformage selon les revendications 8 à 15, caractérisée en ce que la machine de dispersion (2) disperse directement sur la bande criblée inférieure (5') de la presse de préformage (3).
  17. Presse de préformage selon les revendications 8 à 16, caractérisée en ce qu'il est prévu dans la zone de compactage de la presse de préformage (3) une bande de pré-compactage (14) en circulation disposée entre les rouleaux de pré-compactage (15) et les bandes criblées (5').
  18. Presse de préformage selon la revendication 17, caractérisée en ce que l'une des bandes de pré-compactage (14) ou les deux sont réalisées sous la forme de bandes criblées.
  19. Presse de préformage selon la revendication 17, caractérisée en ce que l'une des bandes de pré-compactage (14) ou les deux sont réalisées comme des bandes imperméables.
  20. Presse de préformage selon les revendications 8 à 17, caractérisée en ce que les chambres de vapeur (7), les chambres d'aspiration (8) et les caissons de vapeur (10) ont une longueur et une largeur variables et sont segmentés et les paramètres de ces segments peuvent être contrôlés séparément.
  21. Presse de préformage selon une ou plusieurs des revendications 8 à 20, caractérisée en ce que le rouleau de mise en circulation (4') est disposée de façon réglable en hauteur.
  22. Presse de préformage selon une ou plusieurs des revendications 8 à 21, caractérisée en ce que les lèvres d'étanchéité (13) sont disposées de façon réglable en hauteur en fonction des besoins et de la position du rouleau de mise en circulation (4') ou du rouleau de compactage (6').
EP20060007422 2005-04-08 2006-04-07 Méthode de préchauffage en continu d'un mat ou d'un non tissé, et prépresse utilisé Not-in-force EP1710061B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510016408 DE102005016408A1 (de) 2005-04-08 2005-04-08 Verfahren zur kontinuierlichen Vorwärmung eines Vlieses oder einer Matte und Vorrichtung zur Durchführung des Verfahrens

Publications (2)

Publication Number Publication Date
EP1710061A1 EP1710061A1 (fr) 2006-10-11
EP1710061B1 true EP1710061B1 (fr) 2014-06-11

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EP20060007422 Not-in-force EP1710061B1 (fr) 2005-04-08 2006-04-07 Méthode de préchauffage en continu d'un mat ou d'un non tissé, et prépresse utilisé

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EP (1) EP1710061B1 (fr)
DE (1) DE102005016408A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2585367T3 (es) 2009-04-17 2016-10-05 Flooring Technologies Ltd. Procedimiento para fabricar una placa de compuesto de madera
EP2388117A1 (fr) 2010-05-17 2011-11-23 Flooring Technologies Ltd. Procédé et installation de fabrication d'une plaque en fibres de bois
DE102019114021B3 (de) 2019-05-24 2020-11-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren und Vorrichtung zur Vorwärmung einer Pressgutmatte
EP3993974A1 (fr) * 2019-07-04 2022-05-11 Dieffenbacher Gmbh Maschinen- Und Anlagenbau Dispositif et procédé pour transporter un non-tissé

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640682A1 (de) 1986-11-28 1988-06-09 Baehre & Greten Verfahren und vorrichtung zum kontinuierlichen vorwaermen eines vlieses fuer die herstellung von span-, faser- oder dergleichen platten
DE4415276A1 (de) * 1994-04-30 1995-11-02 Siempelkamp Gmbh & Co Verfahren zur Herstellung von Holzwerkstoffplatten
DE4441017A1 (de) 1994-11-17 1996-05-23 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur kontinuierlichen Herstellung von Holzwerkstoffplatten
DE4440997A1 (de) 1994-11-17 1996-05-23 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur kontinuierlichen Herstellung von Holzwerkstoffplatten
DE19957265A1 (de) * 1999-11-28 2001-05-31 Dieffenbacher Gmbh Maschf Verfahren und Dampfpresse zur Herstellung von Holzwerkstoffplatten
DE10232271A1 (de) * 2001-01-17 2004-02-05 Maschinenfabrik J. Dieffenbacher Gmbh & Co Verfahren und Anlage zur Herstellung von Holzwerkstoffplatten
DE10207573C1 (de) 2002-02-22 2003-07-03 Siempelkamp Masch & Anlagenbau Anlage zum Herstellen von Spanplatten, Faserplatten o. dgl. Holzwerkstoffplatten aus Pressgutmatten

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EP1710061A1 (fr) 2006-10-11
DE102005016408A1 (de) 2006-10-12

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